During a Run the Jewels show in St. Louis last night, rapper Killer Mike took time to reflect on a grand jury’s decision not to indict Officer Darren Wilson in the death of teenager Michael Brown.

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Killer Mike, who has spoken publicly about the events in Ferguson previously, talked for an emotional four minutes. “You motherf–kers got me today,” he said. “You kicked me on my ass today because I have a 20-year-old son, I have a 12-year-old son and I’m so afraid for them.”

Just before launching into the a performance of the song “Run the Jewels” Killer Mike said, “So I might go tomorrow, I might go the day after, but the one thing I want you to know: It is us against the motherf–king machine.”

Killer Mike penned an op-ed for Billboard in August in which he wrote: “I have chimed in about the brutality that killed this child, Michael Brown, and Eric Garner, and so many others. It’s shameful, but these are not simply words to commiserate; these words, I hope, serve as a wake-up call to all Americans. Our rights are being violated by people we pay daily. This must end, or every American has failed.”